Tag Archive for 'none'

I originally had the function below to convert values of None into values of NaN, but realized it is much faster and easier to coerce the array type:

x.astype(float)

Here’s the slow way to do it:

from numpy import array, nan
def None2NaN(x):
    """Converts None objects to nan, for use in
       NumPy arrays. Returns an array."""
    newlist = []
    for i in x:
        if i is not None:
            newlist.append(i)
        else:
            newlist.append(nan)
    return array(newlist)